/* CoralCube | Massively Multiplayer Online Role-Playing Game(MMORPG) Emulator.
|* 
|* Copyright (C) 2005-2010 MaNGOS <http://getmangos.com/>
|*               2008-2010 TrinityCore <http://www.trinitycore.org/>
|*               2008-2010 CoralCube <http://www.CoralCube.com/>
|*
|* This program is free software. You can redistribute it and/or modify it under the terms of 
|* the GNU General Public License as published by the Free Software Foundation, either 
|* version 2 of the License.
|*
|* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY, 
|* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
|* See the GNU General Public License for more details.
|*
|* You should have received a copy of the GNU General Public License along with this program. 
|* If not, see <http://www.gnu.org/licenses/>.
|*/

#include "MapUpdater.h"
#include "DelayExecutor.h"
#include "Map.h"
#include "DatabaseEnv.h"

#include <ace/Guard_T.h>
#include <ace/Method_Request.h>

class WDBThreadStartReq1 : public ACE_Method_Request
{
public:

    WDBThreadStartReq1() { }

    virtual int call()
    {
        return 0;
    }
};

class WDBThreadEndReq1 : public ACE_Method_Request
{
public:

    WDBThreadEndReq1() { }

    virtual int call()
    {
        return 0;
    }
};

class MapUpdateRequest : public ACE_Method_Request
{
private:

    Map& m_map;
    MapUpdater& m_updater;
    ACE_UINT32 m_diff;

public:

    MapUpdateRequest(Map& m, MapUpdater& u, ACE_UINT32 d) : m_map(m), m_updater(u), m_diff(d) { }

    virtual int call()
    {
        m_map.Update (m_diff);
        m_updater.update_finished ();
        return 0;
    }
};

MapUpdater::MapUpdater():
m_executor(), m_mutex(), m_condition(m_mutex), pending_requests(0) { }

MapUpdater::~MapUpdater()
{
    deactivate();
}

int MapUpdater::activate(size_t num_threads)
{
    return m_executor.activate((int)num_threads, new WDBThreadStartReq1, new WDBThreadEndReq1);
}

int MapUpdater::deactivate()
{
    wait();

    return m_executor.deactivate();
}

int MapUpdater::wait()
{
    ACE_GUARD_RETURN(ACE_Thread_Mutex, guard, m_mutex, -1);

    while (pending_requests > 0)
        m_condition.wait();

    return 0;
}

int MapUpdater::schedule_update(Map& map, ACE_UINT32 diff)
{
    ACE_GUARD_RETURN(ACE_Thread_Mutex, guard, m_mutex, -1);

    ++pending_requests;

    if (m_executor.execute(new MapUpdateRequest(map, *this, diff)) == -1)
    {
        ACE_DEBUG((LM_ERROR, ACE_TEXT("(%t) \n"), ACE_TEXT("Failed to schedule Map Update")));

        --pending_requests;
        return -1;
    }

    return 0;
}

bool MapUpdater::activated()
{
    return m_executor.activated();
}

void MapUpdater::update_finished()
{
    ACE_GUARD(ACE_Thread_Mutex, guard, m_mutex);

    if (pending_requests == 0)
    {
        ACE_ERROR((LM_ERROR, ACE_TEXT("(%t)\n"), ACE_TEXT("MapUpdater::update_finished BUG, report to devs")));
        return;
    }

    --pending_requests;

    m_condition.broadcast();
}
